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[RESOLVED] CRC calculation implementation HELL..

So now i can comms with the device, however the CRC calculation does not work correctly... (I have 0 access to the Firmware) but the suppliers graciously gave us the CRC calculation in C++, which is as such

Now no matter what i send to the device it always reply's with CRC error "GL!ER20A624" (the last 4 digits are the modules calculated CRC)... And if i send the module some Garbage i get a Invalid request "GL!ER2166E5"..